2018 Tiburon Challenger

The 2018 Tiburon Challenger was a professional tennis tournament played on outdoor hard courts. It was the twelfth edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Tiburon, United States between September 24 and September 30, 2018.

Seeds

 * 1 Rankings are as of September 17, 2018.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇺🇸 JC Aragone
 * 🇺🇸 Tom Fawcett
 * 🇺🇸 Brandon Holt
 * 🇺🇸 Tommy Paul

The following player received entry into the singles main draw as a special exempt:
 * Mikael Torpegaard

The following player received entry into the singles main draw as an alternate:
 * 🇦🇺 James Duckworth

The following players received entry from the qualifying draw:
 * 🇨🇦 Steven Diez
 * 🇹🇷 Cem İlkel
 * 🇪🇸 Roberto Ortega Olmedo
 * 🇺🇸 Alexander Sarkissian

Singles

 * 🇺🇸 Michael Mmoh def. 🇪🇸 Marcel Granollers 6–3, 7–5.

Doubles

 * 🇲🇽 Hans Hach Verdugo / 🇦🇺 Luke Saville def. 🇪🇸 Gerard Granollers / 🇪🇸 Pedro Martínez 6–3, 6–2.